育雛時期の異なる産卵鶏群の最も有利な組合せについて
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概要
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1. What is the best ratio of spring-hatched flock to fall-hatched flock in order to get the highest net profit in a commercial egg farm?As a result of the theoretical analysis of this problem, the following conclusions were reached.(1) In the case of K〈RA: it is most profitable to hold only a spring-hatched flock.(2) K〉RA: the most profitable way is to hold a spring-hatched and a fall-hatched flock at the same ratio of 1-RA/1-Rs at the period when each floak was the largest in number.(3) K=RA: an intermediate value between (1) and (2) should be taken.In the foregoing, K indicates the ratio of the average profit per fall-hatched layer to that per spring-hatched layer.RA indicates the ratio of the remainder of the fall-hatched flock at the period when spring-hatched pullets started laying.Rs indicates the remaining ratio of the spring-hatched flock at the period when fall-hatched pullets started laying.Then, actual profitable ratios under K〉RA were calculated in proportion to several values of Rs and RA.2. If the holding of a laying flock hatched in a certain month is assumed to be a process, there are twelve adoptable processes.The question is what combination of processes is the most profitable.Then, it was pointed out that this problem could be solved from the angle of "linear programing" (L. P.).3. The level of each process and conditions under which a year-around hatching system might be able to be adopted were analyzed by using the basic theory of L. P. solution.Accordingly, the following conclusions were found.(1) The level of each process (Xi) is as follows:xi=Δi/Δ Here, Δ=, and Δi is the determinant in which Ii-rows values are replaced by N.(2) The conditions are as follows:The determinant Δj is possitive. Here, Δj is the determinant in which values of Rj-row are replaced by Ii respectively.In the foregoing, i indicates the hatching month so numbered in the Japanese style and Rij the remaining ratio of the i-month flock in the j-month.
- 社団法人 日本畜産学会の論文